How is parkour helping these seniors avoid injuries?

Q&A: What are chalk streams and why are these rare rivers under threat?

Chalk streams are among the world's rarest river habitats. Fewer than 300 exist globally, and most are found in England. They support rich wildlife and have been described as England's 'Great Barrier Reef' due to their biodiversity.

Brief by WorldPing · Original reporting by Phys.org